EP1931488B1 - A milling cutter and an indexable cutting insert - Google Patents

A milling cutter and an indexable cutting insert Download PDF

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Publication number
EP1931488B1
EP1931488B1 EP06784171.8A EP06784171A EP1931488B1 EP 1931488 B1 EP1931488 B1 EP 1931488B1 EP 06784171 A EP06784171 A EP 06784171A EP 1931488 B1 EP1931488 B1 EP 1931488B1
Authority
EP
European Patent Office
Prior art keywords
cutting insert
indexable
insert
main
indexable cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06784171.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1931488A4 (en
EP1931488A1 (en
Inventor
Matti Karonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seco Tools AB
Original Assignee
Seco Tools AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seco Tools AB filed Critical Seco Tools AB
Publication of EP1931488A1 publication Critical patent/EP1931488A1/en
Publication of EP1931488A4 publication Critical patent/EP1931488A4/en
Application granted granted Critical
Publication of EP1931488B1 publication Critical patent/EP1931488B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B23C5/205—Plate-like cutting inserts with special form characterised by chip-breakers of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/08—Rake or top surfaces
    • B23C2200/085—Rake or top surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/12—Side or flank surfaces
    • B23C2200/123—Side or flank surfaces curved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/203—Curved cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/206—Cutting edges having a wave-form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/28—Angles
    • B23C2200/286—Positive cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/36—Other features of the milling insert not covered by B23C2200/04 - B23C2200/32
    • B23C2200/365—Lands, i.e. the outer peripheral section of rake faces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0407—Cutting angles
    • B23C2210/0442—Cutting angles positive
    • B23C2210/045—Cutting angles positive axial rake angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B23C2210/0407—Cutting angles
    • B23C2210/0442—Cutting angles positive
    • B23C2210/0457—Cutting angles positive radial rake angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2228/00—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner
    • B23C2228/10—Coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1908—Face or end mill
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
    • Y10T407/245—Cutters, for shaping with chip breaker, guide or deflector comprising concave surface in cutting face of tool

Definitions

  • the present invention relates to a milling cutter for chip removing machining and an indexable cutting insert according to the preambles of the appended independent claims.
  • a generally rectangular milling insert is previously known that has two active cutting insert corners, which are provided diagonally opposed on the main surface of the cutting insert.
  • the main cutting edges extend along the long sides of the cutting insert and consequently the minor cutting edges extend along the short sides of the milling insert. Since the milling insert has two active cutting insert corners it is indexable twice.
  • a milling cutter i.e. US 2004208713
  • Each indexable cutting insert comprises four main cutting edges and one minor cutting edge associated with each major cutting edge. In mounted position in the milling cutter body the indexable cutting insert has a positive axial rake angle and a positive radial rake angle.
  • the indexable cutting insert is generally screw shaped along the extension of the main cutting edge.
  • US 2002/122699 on which the preamble of claim 1 is based, discloses a negative, on-edge, square insert for milling having an extra negative ground land.
  • WO 95/19238 A1 and EP 0 505 574 A1 show square, on-edge inserts.
  • a primary object of the present invention is to provide a milling cutter of the above-captioned defined type and an indexable cutting insert adapted to this, said milling cutter being able to machine right-angled corners in a work piece to great cutting depths.
  • An additional object of the present invention is to develop the indexable cutting insert according to the present invention in such a manner that it becomes indexable four times during its life.
  • Still another object of the present invention is to develop the indexable cutting inserts according to the present invention such that a stable localization of the indexable cutting insert in the milling cutter body is made possible.
  • the in Fig. 1 shown milling cutter according to the present invention comprises a milling cutter body 1, which at its lower end in Fig. 1 has a number of cutting insert pockets, in which a corresponding number of indexable cutting inserts 3 is received.
  • Each indexable cutting insert 3 has a center hole 4 and is intended to be clamped in a cutting insert pocket by means of a center screw (not shown) received by the center hole 4.
  • the center axis C-C of the milling cutter is drawn, said center axis C-C also defining the axis of rotation of the milling cutter and its axial direction.
  • the rotational direction R of the milling cutter is depicted by an arrow in Fig. 1 .
  • the milling cutter body 1 is formed for connection with a tool attachment or similar at its upper end in Fig. 1 .
  • the indexable cutting insert 3 according to the present invention is generally rectangular in plan view.
  • the indexable cutting insert 3 is made of directly pressed cemented carbide.
  • cemented carbide is here meant WC, TiC, TaC, NbC, etc., in sintered combination with a binder metal such as for example Co or Ni.
  • the cutting insert is preferably at least partly coated with layer of for example Al 2 O 3 , TiN and/or TiCN. In some cases it can be well-founded that the cutting edges are made of brazed on super hard material such as CBN or PCD.
  • the height of the indexable cutting insert 3 is designated H in Fig. 2 .
  • the width of the indexable cutting insert 3 is designated W in Fig. 2 .
  • H is greater than W, preferably at least 30% greater than W.
  • the indexable cutting insert 3 comprises two substantially identical main surfaces 11, 11A.
  • the center hole 4 extends between the main surfaces 11, 11 A.
  • the indexable cutting insert 3 also comprises two long sides or side surfaces 12 and two short sides or end surfaces 13.
  • the side surfaces 12 and the end surfaces 13 intersect at a cutting insert corner 14.
  • a part of a main surface 11, 11A connects to each cutting insert corner 14.
  • the two cutting insert corners 14 situated on the same main surface are diagonally opposed, as seen in plan view of the indexable cutting insert 3.
  • the remaining two corners on one side do not have any cutting function.
  • the indexable cutting insert 3 comprises only one is active at the time, see Fig. 1 .
  • a major cutting edge 15 originates from each cutting insert corner 14, which extends in the height direction of the indexable cutting insert 3 and substantially along the entire associated side surface 12. Also a minor cutting edge 16 originates from each cutting insert corner 14, which extends in the width direction of the indexable cutting insert 3 and along a part of the associated end surface 13. The part of the main surface 11, 11A connecting to the main cutting edge 15 and the minor cutting edge 16 is formed as a chip breaker.
  • the active the main cutting edge 15 of the indexable cutting insert 3 has a negative, increasing axial angle from the cutting corner 14 to approximately half the extension of the indexable cutting insert 3 in the height direction, when the indexable cutting insert is mounted in a cutting insert seat in the milling cutter body 1.
  • This part of the main cutting edge 15 is depicted by 15'.
  • the negative axial angle is depicted by ⁇ 1 in the vicinity of the cutting corner 14 and with ⁇ 2 in the area of the half height of the indexable cutting insert 3.
  • the part of the main cutting edge 15 that in Fig. 3 is situated above the half height of the indexable cutting insert 3 is depicted by 15".
  • This part 15" has a positive axial angle, which diminishes in direction from the half height and upwards.
  • the positive axial angle is designated ⁇ 3 and in the area of the upper end of the indexable cutting insert 3 in Fig. 3 the positive axial angle is designated ⁇ 4.
  • an appropriate value for ⁇ 1 and ⁇ 4 is about 7° while an appropriate value for ⁇ 2 and ⁇ 3 is about 18°. Consequently, for the embodiment of the indexable cutting insert 3 shown in Figs. 2-4 applies that the negative axial angle increases from about 7° to about 18° while the positive axial angle diminishes from about 18° to about 7°.
  • the main cutting edge 15 comprises a crest 18 provided where the parts 15' and 15" of the main cutting edge connect to each other.
  • the crest 18 is indented in relation to a plane P1 that touches the associated side surface 12 at least at three points.
  • the above described design of the axial angle of the main cutting edge 15 entails that the perpendicular distance of each main cutting edge 15 to a plane that is situated in the opposed support surface 17A increases in direction from the cutting corner 14 to the area of the half height of the indexable cutting insert 3.
  • the perpendicular distance of each main cutting edge 15 to the plane that is situated in the opposed the support surface 17A diminishes from the area of the half height of the indexable cutting insert 3 and from the cutting corner 14, in direction towards the passive corner. Said distance is consequently related relative to the support surface 17, 17A that is provided farthest from the current or operative main cutting edge 15, and therefore the expressions "the support surface facing away from the main cutting edge" and "opposed” is used in the claims.
  • Each support surface 17, 17A is provided distant from the periphery of the indexable cutting insert to avoid interference with cutting edge areas.
  • a major cutting edge is depicted by 15A, which is associated with the main surface 11A, see Fig. 4 .
  • the main cutting edge 15A comprises two parts of the main cutting edge 15'A and 15"A.
  • the side surfaces 12 have a certain concavity in the height direction of the indexable cutting insert 3, at least in the part of the side surfaces 12 that connect to the main cutting edge 15.
  • the reason for this design is that the right main cutting edge 15 in Fig. 2 must be completely straight in the shown perspective view.
  • each support surface 17, 17A is generally angled in the height direction of the indexable cutting insert 3 substantially in its diagonal direction such that the distance between the support surface 17 and the main cutting edge 15 is greater in the area of the cutting corner 14, i.e., greater in the area of the lower part 15' of the main cutting edge than in the area of the upper part 15" of the main cutting edge 15.
  • the reason that the support surface 17 has been given a certain inclination in the height direction of the indexable cutting insert 3 is that thereby the distance to the main cutting edge 15 in the area of the cutting corner 14 is reduced. This is perceived also by observing Fig. 2 .
  • the support surface 17A situated at the opposite side, not visible in Fig. 2 has an inclination which makes that the support surface 17A generally approaches the main cutting edges 15 when the support surface 17A approaches respective cutting insert corner 14. In mounted position the support surface 17A cooperates with a correspondingly elevated portion in the insert pocket, whereby an outstandingly rigid fixation of the indexable cutting insert 3 in the insert pocket is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
EP06784171.8A 2005-09-28 2006-09-11 A milling cutter and an indexable cutting insert Not-in-force EP1931488B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0502135A SE529108C2 (sv) 2005-09-28 2005-09-28 Fräs samt vändskär för spånavskiljande bearbetning med skäregg belägen lägre en stödyta
PCT/SE2006/001041 WO2007037734A1 (en) 2005-09-28 2006-09-11 A milling cutter and an indexable cutting insert

Publications (3)

Publication Number Publication Date
EP1931488A1 EP1931488A1 (en) 2008-06-18
EP1931488A4 EP1931488A4 (en) 2011-05-18
EP1931488B1 true EP1931488B1 (en) 2014-12-31

Family

ID=37894184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06784171.8A Not-in-force EP1931488B1 (en) 2005-09-28 2006-09-11 A milling cutter and an indexable cutting insert

Country Status (7)

Country Link
US (1) US7252461B2 (zh)
EP (1) EP1931488B1 (zh)
KR (1) KR101292864B1 (zh)
CN (1) CN101272879B (zh)
CZ (1) CZ303659B6 (zh)
SE (1) SE529108C2 (zh)
WO (1) WO2007037734A1 (zh)

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SE515070C2 (sv) * 1999-10-22 2001-06-05 Sandvik Ab Dubbelnegativt skär till verktyg för spånavskiljande bearbetning
SE520997C2 (sv) * 2001-01-09 2003-09-23 Sandvik Ab Vändbart frässkär med rillförsedd kopplingsyta mot hållaren och centralt materialparti för fästorgan
US6802676B2 (en) * 2001-03-02 2004-10-12 Valenite Llc Milling insert
IL148535A (en) * 2002-03-06 2009-02-11 Gil Hecht Metal cutting tool
SE525878C2 (sv) * 2002-10-10 2005-05-17 Seco Tools Ab Fräsverktyg och indexerbart skär med parallella sidor
DE10312922B4 (de) 2003-03-22 2006-02-16 Walter Ag Schneidplatte und Fräswerkzeug
IL160223A (en) * 2004-02-04 2008-11-26 Carol Smilovici Double-sided cutting insert and milling cutter

Also Published As

Publication number Publication date
SE529108C2 (sv) 2007-05-02
KR101292864B1 (ko) 2013-08-02
US20070071560A1 (en) 2007-03-29
EP1931488A4 (en) 2011-05-18
CZ303659B6 (cs) 2013-02-06
WO2007037734A1 (en) 2007-04-05
KR20080039496A (ko) 2008-05-07
CZ200898A3 (cs) 2008-09-24
CN101272879A (zh) 2008-09-24
US7252461B2 (en) 2007-08-07
SE0502135L (sv) 2007-03-29
EP1931488A1 (en) 2008-06-18
CN101272879B (zh) 2010-12-08

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